Examples

        <%= buttongroup
            buttons => [
                ['Button 1'],
                ['Button 2'],
                ['Button 3'],
            ]
        %>

        <div class="btn-group">
            <button class="btn btn-default" type="button">Button 1</button>
            <button class="btn btn-default" type="button">Button 2</button>
            <button class="btn btn-default" type="button">Button 3</button>
        </div>